[the frown on his features deepens more when he hears what the creature truly is - and he trades the unfortunate harpy for the Guardian. it vaguely reminds him of some of the creatures he's faced in the past, only none of them ate magic and were leashed to the Fae in any aspect.]

Is this what he saw out there?

[kind of a rhetorical question, and he studies it more.]

If it's meant to be a Fae protector, then either the Fae are hiding something out there, or it's very near the entrance to at least one of their courts. Makes no sense to station something far out when you need a guard, unless you have multiple, which is its own consideration.

[putting the paper back down, he looks Eren in the eye.]

Consuming magic shouldn't be a problem if you take up a nonmagical solution. But I don't think you're showing me this to hear me state the obvious.